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Note 11 - Product Warranty Obligations (Details Textual) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Standard Product Warranty Accrual, Warranty Provision	$ 37,338	$ 37,338
Capitalized Contract Cost, Net, Total		9,199	$ 8,479
Capitalized Contract Cost, Amortization		$ 1,932	$ 1,739	$ 1,303
Minimum [Member]
Extended Warranty Term (Year)		5 years
Maximum [Member]
Extended Warranty Term (Year)		10 years

X

- Definition

Expiration period of the extended warranty.

+ References

No definition available.

+ Details

Name:	gnrc_ExtendedWarrantyTerm
Namespace Prefix:	gnrc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of warranty provision for standard product warranty accrual.

+ References

No definition available.

+ Details

Name:	gnrc_StandardProductWarrantyAccrualWarrantyProvision
Namespace Prefix:	gnrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126905575&loc=SL49131252-203054

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126905575&loc=SL49131252-203054

+ Details

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Period Type:	instant

X

- Details

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Period Type:

X

- Details

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